Malicious PDF — malware analysis report

Static analysis result for SHA-256 14cd81237efbe3d1…

MALICIOUS

PDF

42.9 KB Created: 2020-08-09 21:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 450ee6ede4cdf7c6cefc46e6d344c8b0 SHA-1: 85a820a3c2264769c1a43f5bed6c4fee0b5e8588 SHA-256: 14cd81237efbe3d134d06799bf7d4f567eae52384dcc73e252a90075c2ba10de
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/pify?keyword=cement+manufacture+pdf'. Another critical heuristic identified a large PDF link farm, suggesting an attempt to generate traffic or distribute content. The ML classifier strongly flagged this PDF as malicious, and the presence of urgency language further supports a malicious intent. No scripts were extracted, but the primary attack pattern involves redirecting users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=cement+manufacture+pdf
    • http://files.trytank.org/uploads/1/3/0/7/130775762/82ca3499d75479.pdf
    • http://todevoxus.en.homecade.com/uploads/1/3/2/8/132814930/4671885.pdf
    • http://files.ecosystemarts.org/uploads/1/3/0/8/130874474/pamujoduwut-melixanogob-toguwapi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4466/6529/files/10566989315.pdf
    • https://cdn.shopify.com/s/files/1/0437/1123/4199/files/31778020968.pdf
    • https://cdn.shopify.com/s/files/1/0437/1188/9573/files/bedovajizisamev.pdf
    • https://cdn.shopify.com/s/files/1/0431/5355/5624/files/22156375071.pdf
    • https://cdn.shopify.com/s/files/1/0430/6773/6225/files/bagotijelidejavibogekeve.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/79422424034.pdf
    • https://cdn.shopify.com/s/files/1/0428/7853/3788/files/mewizagafekeniti.pdf
    • https://cdn.shopify.com/s/files/1/0446/6376/7203/files/british_english_grammar_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0655/7340/files/adventure_time_battle_party.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/livoxigugefeguvon.pdf
    • https://cdn.shopify.com/s/files/1/0434/8638/0197/files/stardew_valley_night_fishing_bundle.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jikas.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006924.bin
49d71dc24c2aef78746e0b6d0de0beeaeed269989603512fb87ada14ca461757		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6924 4996 bytes
font_01_sfnt_off00007a0e.bin
fb382198b54ff8867a57d73e024f9618088e4f3a68cc434e402dbcb87c714f51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0E 10768 bytes

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